What PNG is and why you might convert to it

PNG (Portable Network Graphics) is an image format that stores pictures without losing quality when you compress them. Unlike JPEG, which throws away some detail to make files smaller, PNG keeps everything but still reduces file size through a different compression method. PNG also supports transparent backgrounds — areas you can see through — which JPEG cannot do.

You convert to PNG when you need a sharper image for printing, when you want a transparent background for a logo or graphic, or when you're uploading to a platform that prefers PNG over other formats. PNG files are larger than JPEG for photographs, but smaller than uncompressed formats like BMP or TIFF.

Key Takeaways

  • Windows users can right-click an image, select "Open with" and choose Photos or Paint, then save as PNG without installing anything.
  • Mac users can open an image in Preview, go to File > Export, and change the format dropdown to PNG.
  • Online converters like CloudConvert or Zamzar work in any browser but upload your file to their servers, so avoid them for private images.
  • PNG works best for graphics, logos, and screenshots; JPEG remains better for photographs because PNG files are much larger.
  • Batch conversion tools like XnConvert let you convert hundreds of images at once instead of one at a time.

Converting on Windows using built-in tools

Windows includes two programs that can open images and save them as PNG without downloading anything. The simplest is the Photos app. Right-click the image file, select "Open with," then choose "Photos." Once the image opens, click the three dots in the top right corner, select "Edit," then click the three dots again and choose "Save as." A dialog box appears — type a new filename if you want, then click the dropdown that shows the current format and select PNG.

If Photos doesn't appear in your "Open with" menu, use Paint instead. Right-click the image, select "Open with," and choose "Paint." Once it opens, click File in the top left, then "Save as," then select PNG from the format list. Type your filename and click Save. Paint is slower than Photos for this task but works on every Windows version.

Converting on Mac using Preview

Mac's Preview app handles PNG conversion without any additional software. Open the image in Preview — you can usually double-click it, or right-click and select "Open with" then "Preview." Once the image is open, click File in the menu bar, then select "Export." A dialog box appears with a format dropdown that likely shows JPEG or the original format. Click that dropdown and select PNG.

If you want a transparent background in your PNG, make sure the image actually contains transparency before you export. Preview can remove backgrounds from some images — select Tools, then when ready Alpha, then click the color you want to remove. After you've made your edits, export as PNG and the transparent areas will be preserved.

Using online converters for quick one-off conversions

Online tools like CloudConvert, Zamzar, and Online-Convert let you upload an image and read it as PNG without installing software. Go to the website, click "Upload File" or "Choose File," select your image, make sure PNG is selected as the output format, then click Convert. The converted file downloads to your computer in seconds.

The trade-off is that your image file travels to someone else's server. For personal photos or sensitive images, this is a privacy concern. For public images or screenshots you don't mind sharing, online converters are the fastest option. Most free versions have file size limits — usually 25 to 100 MB — so very large images may not work.

Batch converting multiple images at once

If you have dozens or hundreds of images to convert, doing them one at a time wastes hours. XnConvert (free for Windows, Mac, and Linux) opens a folder of images and converts them all to PNG in minutes. read and install XnConvert, open it, click the folder icon to select your image folder, then click the Output tab and select PNG from the format list. Click Convert and the program processes every image in that folder.

IrfanView on Windows and Automator on Mac also handle batch conversion, though XnConvert has the clearest interface for this task. Batch tools are worth learning if you regularly work with image libraries or read large sets of screenshots.

Converting documents and screenshots to PNG

Screenshots are already image files, so converting them to PNG is the same as converting any other image — use the methods above. On Windows, press Print Screen, open Paint, paste the screenshot, and save as PNG. On Mac, press Shift-Command-3 to save a screenshot directly as PNG (it appears on your desktop).

If you want to convert a PDF or document page to PNG, the process is different. Open the PDF in your browser or PDF reader, take a screenshot of the page, then save that screenshot as PNG. For higher quality, use a tool like ImageMagick (command line, requires setup) or an online PDF-to-image converter. These preserve text and formatting better than a screenshot.

When PNG is the right choice and when it isn't

PNG is ideal for logos, icons, graphics with text, and anything with a transparent background. It's also good for screenshots because it preserves sharp text and doesn't lose detail. For photographs, PNG files are often three to five times larger than JPEG with no visible quality improvement, so JPEG remains the better choice for photos you're sharing online or storing.

If you're printing an image professionally, ask the printer whether they want PNG, TIFF, or PDF — different printers have different requirements. For web use, modern browsers support PNG perfectly, but JPEG is still smaller for photos. WebP is a newer format that's smaller than both PNG and JPEG, but not all older devices support it yet.

Frequently Asked Questions

Will converting to PNG make my image better quality?

No. PNG compresses without losing detail, but it cannot add detail that wasn't there. If your original image is blurry or low resolution, converting it to PNG keeps it blurry. PNG is useful for preserving the quality you already have, not improving it.

Can I convert a PNG back to JPEG?

Yes, using the same methods — right-click and save as, or use an online converter. If your PNG has a transparent background, that transparency becomes white or another solid color when you convert to JPEG, since JPEG doesn't support transparency.

Why is my PNG file larger than the original JPEG?

PNG uses lossless compression, which keeps all detail but results in larger files for photographs. JPEG throws away some detail to make files much smaller. For photos, JPEG is almost always smaller. PNG is only smaller when the original is already a format like BMP or TIFF.

Do I need special software to open a PNG file?

No. Every browser, every image viewer, and every operating system opens PNG files by default. You only need special software if you want to edit the PNG, not just view it.

What's the difference between PNG-8 and PNG-24?

PNG-8 supports 256 colors and is smaller; PNG-24 supports millions of colors and is larger. Most converters default to PNG-24. Use PNG-8 only for straightforward graphics like logos with few colors, where the smaller file size matters and the color limit doesn't.